Characters that never show any flaws to them. What makes a character a good character is when there are good and bad things about them. That makes them appear more like a person and not just some Jesus-Kun self insert. With flaws, that allows characters to progress themselves, and benefit from...
Roleplays involving characters that all come across the same. Basically, a setting where literally every character is a clone of each other with no defining features whatsoever, only with different faces. I like to go for witty, sarcastic, or impertinent characters because of how defining those...
I’d say a useful way to keep a roleplay active is to setup a Discord channel for OOC communications so you can bitch the nob into responding maintain a degree of chat between your party of roleplayers.
>Axel plants a plastic explosive on the opposite side of the virtual wall, running for cover before detonating the charge<
Did somebody say, Military RPers?
Perhaps it's time to introduce something new... may I suggest a roleplay about a medieval magicians serving under the name of a guild whilst conflicting against prejudice towards wielders of magic?
Well, it depends on how you're firing it, of course. If you're firing this super weapon like a .50 calibrate anti-material rifle (operating within a prone position with a bipod that was for some reason developed for a pistol attached), then you'll be screaming "OH MY HAND" for quite some time...